Method and device for assessing and monitoring voltage security in a power system

Abstract

Provided is a method and device for assessing and monitoring voltage security in a power system. More specifically, a method and device for assessing and monitoring the value of reactive power load when changes in reactive power outputs of at least some of the generators in the electrical power system cause all of the generators in the system to reach the combined operating limit of their reactive power output. In response thereto, the method and device are further adapted to initiate suitable control measures such as switching of transformer banks and / or capacitor / reactor banks, as well as shedding loads whenever necessary to mitigate an impending voltage stability problem.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit under 35 U.S.C. §119(e) of U.S. Provisional Application Ser. No. 60 / 976,324, entitled “METHOD AND DEVICE FOR ASSESSING AND MONITORING VOLTAGE SECURITY IN A POWER SYSTEM,” filed Sep. 28, 2007, naming Vaithianathan Venkatasubramanian and Armando Guzman-Casillas as inventors, the complete disclosure thereof being incorporated herein by reference.FIELD OF THE INVENTION[0002]The present disclosure relates to a method and device for assessing and monitoring voltage security in a power system. More specifically, the method and device provides for the calculation of the value of reactive power load when changes in reactive power outputs of at least some of the generators in the electrical power system cause all of the generators on the system to reach the combined operating limit of their reactive power output.BACKGROUND OF THE INVENTION[0003]Voltage instability has played a major role in at least two of the recent...

AI Technical Summary

Benefits of technology

[0008]In response thereto, the method and device are further adapted to initiate suitable control measures such as switching of transformer banks and/or capacitor/reactor banks, as well as shedding loads whenever necessary to mitigate an impending voltage stability problem. According to one aspec

Problems solved by technology

Voltage instability was encountered in these two blackouts because reactive power supplies such as generator reactive power outputs and shunt capacitor devices were exhausted ahead of the eventual blackouts.

Although there is a breadth of theoretical analysis of voltage stability is relatively well understood, there exist only a few methods and devices for monitoring and mitigating voltage instability in a real-time operational environment.

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